EP0701680B1 - Tubes rainures pour echangeurs thermiques d'appareils de conditionnement d'air et de refrigeration, et echangeurs correspondants - Google Patents

Tubes rainures pour echangeurs thermiques d'appareils de conditionnement d'air et de refrigeration, et echangeurs correspondants Download PDF

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Publication number
EP0701680B1
EP0701680B1 EP94917707A EP94917707A EP0701680B1 EP 0701680 B1 EP0701680 B1 EP 0701680B1 EP 94917707 A EP94917707 A EP 94917707A EP 94917707 A EP94917707 A EP 94917707A EP 0701680 B1 EP0701680 B1 EP 0701680B1
Authority
EP
European Patent Office
Prior art keywords
rib
ribs
tube
tubes
height
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94917707A
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German (de)
English (en)
French (fr)
Other versions
EP0701680A1 (fr
Inventor
Michel Messant
Véronique PINET
René PREDKI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Trefimetaux SAS
Original Assignee
Trefimetaux SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Trefimetaux SAS filed Critical Trefimetaux SAS
Publication of EP0701680A1 publication Critical patent/EP0701680A1/fr
Application granted granted Critical
Publication of EP0701680B1 publication Critical patent/EP0701680B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
    • F28F1/422—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element with outside means integral with the tubular element and inside means integral with the tubular element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S165/00—Heat exchange
    • Y10S165/51—Heat exchange having heat exchange surface treatment, adjunct or enhancement
    • Y10S165/518—Conduit with discrete fin structure
    • Y10S165/524—Longitudinally extending
    • Y10S165/525—Helical

Definitions

  • the invention relates to the field of tubes used to manufacture heat exchangers for air conditioning and refrigeration equipment or for any other heating or cooling application, tubes contributing to ensuring the heat exchange between a fluid circulating in these tubes and the atmosphere circulating in said exchangers.
  • the invention also relates to said exchangers, which generally comprise an assembly of copper, aluminum or steel tubes, generally in pins (straight portions + elbows), and of plates, called fins, in copper or aluminum, in thermal contact with said tubes. and generally perpendicular to said straight portions of the tubes and offering a large exchange surface with said atmosphere.
  • tubes generally of copper tubes and copper alloys, and of means for improving the heat exchanges between the fluid circulating in the tube and the outside atmosphere.
  • application EP-A-0 518 312 describes a tube as defined in the preamble of claim 1.
  • a person skilled in the art has long known the advantage of grooved tubes for increasing the heat exchange between the fluid which circulates inside the tube and the tube itself.
  • Those skilled in the art know that, for a typical copper tube of 9.52 mm outside diameter, it is preferable to have helical ribs / grooves (helix angle between 10 and 30 °), in number sufficient (from 45 to 65).
  • helical ribs / grooves helix angle between 10 and 30 °
  • the Applicant has come to the conclusion, according to which considering and optimizing the performance of a tube in itself would not be of much use, if one did not also take into account the deformations of the ribs / grooves likely to occur during assembly of tubes and fins.
  • the Applicant has therefore sought an optimized groove / rib profile taking into account the crimping, and therefore making it possible to limit the harmful effects of the crimping, crimping which has also beneficial effects on the heat exchange between the tube and the fins, and which constitutes an economical assembly technique.
  • the tube, first object of the invention intended for the manufacture of heat exchangers by crimping said tube with fins, with an external diameter De of between 3 and 30 mm, is grooved internally by n helical ribs, with n between 35 and 90, helix angle between 5 and 50 °, apex angle (alpha) between 30 and 60 °, and is characterized in that said ribs form a periodic profile comprising at least two ribs , of different height, one called “high” of height Hh, and the other called “low” of height Hb, with an Hb / Hh ratio of between 0.40 and 0.97, each "high” rib being between two flat bottom grooves.
  • this Hb / Hh ratio is between 0.6 and 0.95, the heat exchange capacity of the tube after crimping the fins decreasing outside these limits, and decreasing even more outside the limits 0, 40-0.97.
  • the solution found comprises, generically, two essential means constituted, on the one hand, by a periodic profile comprising at least two ribs of different height (Hh and Hb), and on the other hand, by the fact that each rib " high "is between two flat bottom grooves having a cross section of area S.
  • the Applicant was not satisfied with optimizing the internal configuration of the tubes considered in themselves by their heat exchange properties (in evaporation or in condensation), it took into consideration both the manufacture of the tubes themselves, as well as that of the corresponding exchangers by assembling tubes and fins using a crimping mandrel. It is in this context that the invention constitutes an effective solution to the problem posed.
  • Figures 1a and 1b show a cross section of a grooved tube (1) of the prior art, section perpendicular to the axis of the tube, the clear part of the photo on a black background corresponding to the tube.
  • the tube (1) has ribs (2) of triangular section and apex angle close to 90 °, forming between them grooves of substantially section triangular.
  • Figure 2 relates to the prior art and corresponds to Figure 1b, after crimping a tube in the fins during the assembly of a battery, with ribs (20) flattened and deformed, the clear part of the photo on a black background corresponding to the tube.
  • FIG. 3a represents a cross-sectional portion of a grooved tube (1) according to the invention, section perpendicular to the axis of the tube, the light part of the photo on a black background corresponding to the tube. It is formed by an alternation of "high” ribs (2h) and “low” ribs (2b).
  • Figure 3b is the diagram corresponding to photo 3a, on which are identified the two types of ribs (2h and 2b) of respective height Hh and Hb, the grooves (3) of section having an area S, the outside diameter De and the thickness Ep of the tube (thickness at the bottom of the groove).
  • Figures 4a and 4b correspond to Figures 3a and 3b, but after crimping the fins and the tube.
  • the new groove (30) whose section has an area S ' ⁇ S.
  • Figures 5a to 5c similar to Figure 4b, show different methods of the invention.
  • the same figures show the profile of the ribs (2h) and (2b) before crimping (in thick line) and the profile of the ribs (20h) and (20b) after crimping (in thin line) with the widths at mid corresponding height Lh and Lb, as well as the areas S and S 'of the sections of the grooves (3) and (30), respectively before and after crimping.
  • H'b Hb.
  • the rib (2h) (apex angle of 50 °) is triangular, the rib (2b) (apex angle 30 °) also.
  • the ribs (2h) and (2b) are triangular.
  • H'h is close to H'b and H'b ⁇ Hb.
  • Figures 6a and 6b show, in section along the axis of the grooved tube (1), the crimping of fins (4) using a mandrel (5), respectively before the start of crimping and during crimping.
  • Figures 7a and 7b schematically represent different profiles according to the invention. These figures represent a h / b / b type profile, with the conventions defined in FIG. 3b, with, between the two "low” ribs (2b), a trapezoidal groove with a flat bottom in the case of FIG. 7a, and a triangular rib in the case of FIG. 7b. In all cases, each "high" rib (2h) is between two flat bottom grooves (3).
  • said periodic profile comprises the alternation, symbolized by h / b of a "high” rib (2h) and of a “low rib (2b), as shown in FIGS. 3a and 3b, or the succession, symbolized by h / b / b, of a "high” rib and two "low” ribs, as shown in FIGS. 7a and 7b.
  • the h / b profile is preferred, with alternating "high” (2h) and “low” (2b) ribs, which form grooves (3) between them. flat bottom.
  • the invention applies to tubes of very different outside diameters from 3 to 30 mm.
  • the height Hh of the "high" ribs will vary with De, but not necessarily proportionally.
  • the Hh / De ratio must be between 0.003 and 0.05, and preferably between 0.015 and 0.04.
  • said "high" rib (2h) has a substantially triangular section of height Hh.
  • the expression “substantially triangular section” is understood to mean a section whose apex angle is relatively rounded as shown in particular in FIG. 3a which corresponds to a cross section of a real tube (the one described in l 'example) obtained from a photograph.
  • said "high" rib (2h) has a substantially trapezoidal section of height Hh, as shown in FIG. 5a.
  • a second object of the invention is the heat exchanger formed by crimping fins and grooved tubes according to any one of claims 1 to 9 in which, following the passage of a crimping mandrel inside said tubes for assembling, thanks to an expansion of the tubes under the action of the mandrel, said fins and said tubes, the ribs form a periodic profile comprising at least two ribs of different width, one, called “wide” (20h) , with a trapezoidal section and a high half-width Lh, the other, called “narrow” (20b), with a triangular section or trapezoidal and with a width at mid-height Lb low, with a ratio (Lh-Lb) / Of at least equal to 0.003, the value of Lh-Lb being generally at least equal to 0.03 mm for a tube of outside diameter 9.52 mm.
  • FIGS. 5a to 5c show the profile of the ribs and grooves before and after crimping: the "high" rib (2h) before crimping becomes the rib (20h) of lesser height after crimping, on the other hand, the "low” rib (2b) becomes the rib (20b) after crimping - by designation symmetry - but it is in fact little modified by crimping (slightly flattened in Figure 5c, unchanged in Figures 5a and 5b).
  • the section S ′ of said flat bottom grooves (30) has an area between 0.015 and 0.060 mm 2 , preferably between 0.35 and 0.60 for a tube of 9.52 mm outside diameter.
  • Examples 1, 3, 5, 6, 8 and 9 are according to the invention, with a tube profile according to Figures 3a / 3b, Examples 2, 4 and 7 being comparative examples according to the prior art.
  • the heat exchange coefficients (W / m 2 .K) were carried out as a function of the beta helix angle (18 ° for the test tube 8, 30 ° for the test tube 9 and 0 ° for the test tube 10) of tubes after crimping. The measurements were carried out in condensation for different values of freon flow rate R22.
  • Results value of the heat exchange coefficient in W / m 2 .K) Freon flow rate in kg / s
  • Example 8 Example 9
  • Example 10 0.08 2000 3450 1750 0.10 2700 4300 2150 0.12 3500 4950 2500 0.14 4500 5600 3000 0.16 5000 6400 3500 0.18 5800 7300 4000 0.20 6550 8000 4450
  • the essential advantage of the invention is therefore to limit the decrease in performance (in particular the exchange coefficient) during the assembly of the tubes and the fins, by crimping, in order to manufacture a heat exchanger. Thanks to the invention, thanks to the concept of the periodic profile with at least two ribs of different height, one of which "is sacrificed” during crimping to "protect” the lower rib (s), it is therefore possible to use an economical and efficient assembly process while retaining a high exchange capacity for the tube itself.
  • the tube according to the invention since the production of tubes according to the invention does not require any means other than the usual means for producing standard grooved tubes, the tube according to the invention therefore does not cost more than a tube according to the prior art .
  • the grooved tubes according to the invention also have the advantage of being particularly suitable for the manufacture of heat exchangers with crimped fins, without losing their effectiveness compared to the grooved tubes of the prior art in applications which do '' Alter little or no grooves of the starting tubes, for example in exchangers with welded or brazed fins.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Chemical Vapour Deposition (AREA)
EP94917707A 1993-06-07 1994-06-02 Tubes rainures pour echangeurs thermiques d'appareils de conditionnement d'air et de refrigeration, et echangeurs correspondants Expired - Lifetime EP0701680B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9307021 1993-06-07
FR9307021A FR2706197B1 (fr) 1993-06-07 1993-06-07 Tubes rainurés pour échangeurs thermiques d'appareils de conditionnement d'air et de réfrigération, et échangeurs correspondants.
PCT/FR1994/000646 WO1994029661A1 (fr) 1993-06-07 1994-06-02 Tubes rainures pour echangeurs thermiques d'appareils de conditionnement d'air et de refrigeration, et echangeurs correspondants

Publications (2)

Publication Number Publication Date
EP0701680A1 EP0701680A1 (fr) 1996-03-20
EP0701680B1 true EP0701680B1 (fr) 1997-01-08

Family

ID=9448003

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94917707A Expired - Lifetime EP0701680B1 (fr) 1993-06-07 1994-06-02 Tubes rainures pour echangeurs thermiques d'appareils de conditionnement d'air et de refrigeration, et echangeurs correspondants

Country Status (15)

Country Link
US (1) US5692560A (es)
EP (1) EP0701680B1 (es)
KR (1) KR100300237B1 (es)
CN (1) CN1065044C (es)
AU (1) AU677850B2 (es)
BR (1) BR9406753A (es)
CA (1) CA2164515C (es)
DE (1) DE69401434T2 (es)
ES (1) ES2096473T3 (es)
FR (1) FR2706197B1 (es)
GR (1) GR3022274T3 (es)
IL (1) IL109752A (es)
MY (1) MY110604A (es)
SA (1) SA94150259B1 (es)
WO (1) WO1994029661A1 (es)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003076861A1 (fr) * 2002-03-12 2003-09-18 Trefimetaux Tubes rainures a utilisation reversible pour echangeurs thermiques
FR2855601A1 (fr) 2003-05-26 2004-12-03 Trefimetaux Tubes rainures pour echangeurs thermiques a fluide monophasique, typiquement aqueux

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US6159781A (en) * 1998-10-01 2000-12-12 Chartered Semiconductor Manufacturing, Ltd. Way to fabricate the self-aligned T-shape gate to reduce gate resistivity
FR2795168B1 (fr) 1999-06-16 2001-08-03 Ciat Sa Element d'echange thermique pourvu de nervures et son procede de fabrication, echangeur de chaleur pourvu d'un tel element
US6883597B2 (en) 2001-04-17 2005-04-26 Wolverine Tube, Inc. Heat transfer tube with grooved inner surface
JP4822238B2 (ja) * 2001-07-24 2011-11-24 株式会社日本製鋼所 液媒用内面溝付伝熱管とその伝熱管を用いた熱交換器
WO2003052338A1 (en) * 2001-12-17 2003-06-26 Showa Denko K.K. Heat exchanger and process for fabricating same
US7311137B2 (en) * 2002-06-10 2007-12-25 Wolverine Tube, Inc. Heat transfer tube including enhanced heat transfer surfaces
US8573022B2 (en) * 2002-06-10 2013-11-05 Wieland-Werke Ag Method for making enhanced heat transfer surfaces
CA2489104C (en) * 2002-06-10 2011-10-18 Wolverine Tube, Inc. Method of manufacturing a tube
JP4597475B2 (ja) * 2002-12-12 2010-12-15 住友軽金属工業株式会社 熱交換器用クロスフィンチューブの製造方法及びクロスフィン型熱交換器
US20060112535A1 (en) 2004-05-13 2006-06-01 Petur Thors Retractable finning tool and method of using
JP4651366B2 (ja) * 2004-12-02 2011-03-16 住友軽金属工業株式会社 高圧冷媒用内面溝付伝熱管
MX2007011736A (es) * 2005-03-25 2008-01-29 Wolverine Tube Inc Herramienta para producir superficies de transferencia.
CN100451531C (zh) * 2005-03-25 2009-01-14 清华大学 一种热水器换热管
US20060218791A1 (en) * 2005-03-29 2006-10-05 John Lamkin Fin-tube heat exchanger collar, and method of making same
JP4665713B2 (ja) * 2005-10-25 2011-04-06 日立電線株式会社 内面溝付伝熱管
CN100458344C (zh) * 2005-12-13 2009-02-04 金龙精密铜管集团股份有限公司 一种电制冷满液式机组用铜冷凝换热管
CN100437011C (zh) * 2005-12-13 2008-11-26 金龙精密铜管集团股份有限公司 一种电制冷机组用满液式铜蒸发换热管
MY180662A (en) * 2006-06-14 2020-12-04 Dura Line India Pvt Ltd A duct with internal spiral ribs
TWI413887B (zh) * 2008-01-07 2013-11-01 Compal Electronics Inc 熱管結構
JP2010038502A (ja) * 2008-08-08 2010-02-18 Mitsubishi Electric Corp 熱交換器用の伝熱管、熱交換器、冷凍サイクル装置及び空気調和装置
JP2011144989A (ja) * 2010-01-13 2011-07-28 Mitsubishi Electric Corp 熱交換器用の伝熱管、熱交換器、冷凍サイクル装置及び空気調和装置
DE102010007570A1 (de) * 2010-02-10 2011-08-11 ThyssenKrupp Nirosta GmbH, 47807 Produkt für strömungstechnische Anwendungen, Verfahren zu seiner Herstellung und Verwendung eines solchen Produkts
US9279624B2 (en) * 2011-03-01 2016-03-08 Mitsubishi Electric Corporation Heat exchanger tube with collared fins for enhanced heat transfer
CN104807358A (zh) * 2014-01-29 2015-07-29 卢瓦塔埃斯波公司 截面不规则的内槽管
DE102014017426A1 (de) * 2014-11-25 2016-05-25 Wieland-Werke Ag Verfahren zur Herstellung einer innenstruktuierten Gleitlagerbuchse
CN112577355A (zh) * 2019-09-27 2021-03-30 约克（无锡）空调冷冻设备有限公司 一种换热管、换热器及使用该换热器的空调系统
CN110986626B (zh) * 2019-12-24 2021-01-29 重庆大学 周向变化肋结构的防积灰叉排三维肋管束及管壳式换热器

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003076861A1 (fr) * 2002-03-12 2003-09-18 Trefimetaux Tubes rainures a utilisation reversible pour echangeurs thermiques
FR2837270A1 (fr) 2002-03-12 2003-09-19 Trefimetaux Tubes rainures a utilisation reversible pour echangeurs thermiques
FR2855601A1 (fr) 2003-05-26 2004-12-03 Trefimetaux Tubes rainures pour echangeurs thermiques a fluide monophasique, typiquement aqueux

Also Published As

Publication number Publication date
IL109752A (en) 1998-10-30
GR3022274T3 (en) 1997-04-30
EP0701680A1 (fr) 1996-03-20
ES2096473T3 (es) 1997-03-01
AU677850B2 (en) 1997-05-08
CA2164515A1 (fr) 1994-12-22
MY110604A (en) 1998-08-29
CN1125000A (zh) 1996-06-19
IL109752A0 (en) 1994-08-26
DE69401434T2 (de) 1997-05-28
FR2706197B1 (fr) 1995-07-28
CA2164515C (fr) 1999-09-07
WO1994029661A1 (fr) 1994-12-22
KR960702900A (ko) 1996-05-23
US5692560A (en) 1997-12-02
DE69401434D1 (de) 1997-02-20
FR2706197A1 (fr) 1994-12-16
AU6932194A (en) 1995-01-03
KR100300237B1 (ko) 2001-11-22
CN1065044C (zh) 2001-04-25
SA94150259B1 (ar) 2005-12-26
BR9406753A (pt) 1996-02-27

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